Filter cartridge



FIG. 1 is a top, rear, and right side perspective view of a filter cartridge of our design;

FIG. 2 is a top, front, and right side perspective view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a rear side view thereof;

FIG. 5 is a front side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines represent portions of the filter cartridge that form no part of the claimed design. 

CLAIM The ornamental design for a filter cartridge, as shown and described. 